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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804f65c858a13a88cfe6f5e59ef062666d357fab45c5a2c59397d83f1a48088b' 
  AND token = '1nHRnc+NqysmsinG4jkxrUK14UseHAq96D5QRA0ayB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}